feat(meal): 添加餐品列表下拉刷新和上拉加载功能

- 集成 SmartRefreshLayout 实现下拉刷新和上拉加载更多
- 修改 MealListActivity 添加分页加载逻辑，每页30条数据
- 实现空视图显示功能，当无数据时展示暂无数据提示
- 优化 RecyclerView 点击事件处理，使用 startActivity 扩展函数
- 添加加载状态管理，区分首次加载和后续加载情况
- 实现加载失败时的状态回退和错误处理机制
- 统一网络请求回调处理，优化 Loading 状态显示逻辑

app/src/main/java/com/shuwei/dish/match/net/NetViewModelV2.kt

@@ -114,7 +114,8 @@ class NetViewModelV2(
     ) {
         viewModelScope.launch {
             onLoading()
-            onResult(repository.getFoodOptions(keyword, pageNum, pageSize))
+            val state = repository.getFoodOptions(keyword, pageNum, pageSize)
+            onResult(state)
         }
     }
 

app/src/main/java/com/shuwei/dish/match/ui/MealListActivity.kt

@@ -2,14 +2,17 @@ package com.shuwei.dish.match.ui
 
 import android.content.Intent
 import android.os.Bundle
+import android.view.LayoutInflater
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.shuwei.dish.match.adapter.MealListAdapter
 import com.shuwei.dish.match.base.BaseActivity
 import com.shuwei.dish.match.databinding.ActivityMealListBinding
+import com.shuwei.dish.match.databinding.LayoutEmptyViewBinding
 import com.shuwei.dish.match.model.NutFoodOptionVO
 import com.shuwei.dish.match.net.NetViewModelV2
 import com.shuwei.dish.match.net.UiState
 import com.shuwei.dish.match.utils.ext.gone
+import com.shuwei.dish.match.utils.ext.startActivity
 import com.shuwei.dish.match.utils.ext.toast
 import com.shuwei.dish.match.utils.ext.visible
 
@@ -20,13 +23,24 @@ class MealListActivity : BaseActivity() {
 
     companion object {
         const val MEAL_ITEM = "mealItem"
+        const val PAGE_SIZE = 30
     }
 
     private val binding by lazy { ActivityMealListBinding.inflate(layoutInflater) }
     private val viewModelV2 by lazy { NetViewModelV2() }
 
     private val mealList = mutableListOf<NutFoodOptionVO>()
-    private val mealAdapter by lazy { MealListAdapter(mealList) }
+    private val mealAdapter by lazy { MealListAdapter(mealList).apply {
+        isStateViewEnable = true
+        setOnItemClickListener { _, _, position ->
+            val item = mealList.getOrNull(position) ?: return@setOnItemClickListener
+            startActivity<PackActivity>{
+                putExtra(PackActivity.MEAL_ITEM, item)
+            }
+        }
+    } }
+    private var emptyViewBinding: LayoutEmptyViewBinding? = null
+    private var currentPage = 1
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -54,12 +68,15 @@ class MealListActivity : BaseActivity() {
     private fun initRecyclerView() {
         binding.rvMealList.layoutManager = LinearLayoutManager(this)
         binding.rvMealList.adapter = mealAdapter
-        mealAdapter.setOnItemClickListener { _, _, position ->
-            val item = mealList.getOrNull(position) ?: return@setOnItemClickListener
-            val intent = Intent(this, PackActivity::class.java).apply {
-                putExtra(PackActivity.MEAL_ITEM, item)
-            }
-            startActivity(intent)
+        binding.refreshLayout.setEnableRefresh(true)
+        binding.refreshLayout.setEnableLoadMore(true)
+        binding.refreshLayout.setOnRefreshListener {
+            currentPage = 1
+            loadMealList()
+        }
+        binding.refreshLayout.setOnLoadMoreListener {
+            currentPage++
+            loadMealList()
         }
     }
 
@@ -67,32 +84,70 @@ class MealListActivity : BaseActivity() {
      * 加载餐品列表
      */
     private fun loadMealList() {
+        showLoading("加载中……")
         viewModelV2.getFoodOptionsWithCallback(
             keyword = null,
-            pageNum = 1,
-            pageSize = 100,
-            onLoading = {
-                showLoading("加载中……")
-            },
+            pageNum = currentPage,
+            pageSize = PAGE_SIZE,
+            onLoading = {},
             onResult = { state ->
                 dismissLoading()
                 when (state) {
                     is UiState.Success -> {
                         val records = state.data?.records
-                        if (records.isNullOrEmpty()) {
-                            toast("暂无数据")
+                        if (currentPage == 1 && records.isNullOrEmpty()) {
+                            binding.refreshLayout.finishRefresh()
+                            loadEmptyView()
                             return@getFoodOptionsWithCallback
                         }
-                        mealList.clear()
-                        mealList.addAll(records)
+                        if (currentPage == 1) {
+                            mealList.clear()
+                        }
+                        mealList.addAll(records!!)
                         mealAdapter.notifyDataSetChanged()
+                        val isLoadMore = records.size >= PAGE_SIZE
+                        binding.refreshLayout.setEnableLoadMore(isLoadMore)
+                        if (isLoadMore) {
+                            binding.refreshLayout.finishLoadMore()
+                        } else {
+                            binding.refreshLayout.finishLoadMoreWithNoMoreData()
+                        }
                     }
                     is UiState.Error -> {
                         toast(state.msg)
+                        if (currentPage == 1) {
+                            binding.refreshLayout.finishRefresh()
+                            loadEmptyView()
+                        } else {
+                            currentPage--
+                            binding.refreshLayout.finishLoadMore()
+                        }
                     }
                     else -> {}
                 }
             }
         )
     }
+
+    /**
+     * 加载空视图
+     */
+    private fun loadEmptyView() {
+        mealList.clear()
+        mealAdapter.notifyDataSetChanged()
+        if (emptyViewBinding == null) {
+            emptyViewBinding = LayoutEmptyViewBinding.inflate(
+                LayoutInflater.from(this), binding.rvMealList, false
+            )
+        }
+        emptyViewBinding?.run {
+            tvContent.text = "暂无数据"
+            tvSubContent.text = "暂无餐品数据"
+            mealAdapter.stateView = root
+        }
+        binding.refreshLayout.run {
+            setEnableRefresh(true)
+            setEnableLoadMore(false)
+        }
+    }
 }

app/src/main/res/layout/activity_meal_list.xml

@@ -26,15 +26,30 @@
             android:textColor="@color/black666"
             android:textSize="28sp" />
 
-        <androidx.recyclerview.widget.RecyclerView
-            android:id="@+id/rvMealList"
+        <com.scwang.smart.refresh.layout.SmartRefreshLayout
+            android:id="@+id/refreshLayout"
             android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            android:layout_marginBottom="20dp"
-            android:overScrollMode="never"
-            android:scrollbars="vertical"
-            tools:itemCount="3"
-            tools:listitem="@layout/list_item_food2" />
+            android:layout_height="match_parent">
+
+            <com.scwang.smart.refresh.header.ClassicsHeader
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content" />
+
+            <androidx.recyclerview.widget.RecyclerView
+                android:id="@+id/rvMealList"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:layout_marginBottom="20dp"
+                android:overScrollMode="never"
+                android:scrollbars="vertical"
+                tools:itemCount="3"
+                tools:listitem="@layout/list_item_food2" />
+
+            <com.scwang.smart.refresh.footer.ClassicsFooter
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content" />
+
+        </com.scwang.smart.refresh.layout.SmartRefreshLayout>
 
     </LinearLayout>